On Thursday 06 April 2017 08:56 PM, Jon Hunter wrote:
On 06/04/17 15:21, Laxman Dewangan wrote:
In some of NVIDIA Tegra's platform, PWM controller is used to
control the PWM controlled regulators. PWM signal is connected to
the VID pin of the regulator where duty cycle of PWM signal decide
the voltage level of the regulator output.
The tristate (high impedance of PWM pin form Tegra) also define
s/form/from/
s/define/defines/
one of the state of PWM regulator which needs to be configure in
suspend state of system.
It maybe clearer to say that when the system enters suspend the
regulator requires the pwm output to be tristated.
Not necessarily that every PWM regulator interfaces needs it. It
depends on the devices.
So I will say:
When system enters suspend, in some of PWM regulator interface, it is
required to to set the PWM output to be tristated.
pwm: pwm@7000a000 {
@@ -29,3 +42,33 @@ Example:
resets = <&tegra_car 17>;
reset-names = "pwm";
};
+
+
+Example with the pin configuration for suspend and resume:
+=========================================================
+Pin PE7 is used as PWM interface.
Nit-pick. On what devices? Sounds like this is verbatim. Maybe state
what device this is an example for.
Let me phrase it as:
Suppose pin PE7 (On tegra210) interfaced with the regulator device and
this requires PWM output to be tristated when system enters suspend.
Following will be DT binding to achieve this:
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